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Fuses: 5BHLE-300E Application Field and Working Principle

Fuses are electrical protection devices which are designed to open a circuit in the event of an overload or short circuit. They are available in various sizes and ratings, making them suitable for a wide variety of different applications. The 5BHLE-300E is a type of fuse designed for medium voltage applications and is suitable for protecting medium voltage electrical systems. This article will discuss the application field and working principle of the 5BHLE-300E fuse.

Application Field

The 5BHLE-300E fuse is a specially designed, high-performance fuse suitable for medium voltage applications. It is used in residential and commercial buildings and factories where high current or short circuit protection is required. The fuse can be used in both indoor and outdoor installations and has been tested and certified according to relevant international standards. It complies with the requirements of IEC 60269-2, IEC 61828-2, IEC 60529-1 and IEC 60947-2.

The fuse is most commonly used in distribution boards where it provides effective protection against short circuits and overloads. It is also used in motor and transformer applications to protect against thermal overload or short circuit faults. The fuse is also suitable for use in switchgear systems for effective overcurrent protection.

Working Principle

The 5BHLE-300E fuse is an automatic reset type fuse which operates on the principle of a melting element. It is made up of a copper strip that is enclosed in a glass tube filled with an inert gas. This strip conducts electric current and when overloaded, the strip melts and disrupts the current. This disruption of current causes the fuse to blow, which in turn Trip the Circuit Breaker. The fuse then needs to be manually reset to be usable again.

The 5BHLE-300E fuse has a range of current ratings from 25 to 315A and is suitable for Operation Voltage of up to 5kV. The fuse is designed with a built-in overcurrent protection device which will trip the circuit if the current exceeds the specified ratings. This overcurrent protection device prevents damage to connected equipment and circuitry as well as injury to personnel. The fuse also has a short circuit protection device which will trip the circuit if the short duration current exceeds 10 times the rated value.

The fuse also has a built-in thermal protection device which is designed to trip the circuit if the ambient temperature exceeds a pre-set level. This thermal protection device prevents the fuse from overheating and thus prevents damage to connected equipment and circuitry.

Conclusion

The 5BHLE-300E fuse is a medium voltage fuse suitable for a range of applications where effective short circuit and overload protection is required. It is equipped with a range of safety features which include an overcurrent protection device, a short circuit protection device and a thermal protection device. It is compliant with a number of international standards and is widely used in residential and commercial buildings and factories.

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